Usually it is a good thing. It opens up the possibility of Top Rated Seller status. That comes with a 20% discount on eBay fees. Look up the requirements on your seller dashboard and you will see what you need to aim for. Basically, just go above and beyond with customer service and you should achieve it.

There are other benefits to TRS status as well... For example, if you want the top spot on an item page listed by UPC Code, it is available to you if you are the TRS with the lowest price. Not a bad thing. I make sales with and without TRS status, but I like the discount.